geometric.mean {psych}

Find the geometric mean of a vector or columns of a data.frame.

Description

The geometric mean is the nth root of n products or e to the mean log of x. Useful for describing non-normal, i.e., geometric distributions.

Usage

geometric.mean(x,na.rm=TRUE)

Arguments

x

a vector or data.frame

na.rm

remove NA values before processing

Details

Useful for teaching how to write functions, also useful for showing the different ways of estimating central tendency.

Value

geometric mean(s) of x or x.df.

Note

Not particularly useful if there are elements that are <= 0.

Author(s)

William Revelle

See Also

harmonic.mean, mean

Examples

x <- seq(1,5)
x2 <- x^2
x2[2] <- NA
X <- data.frame(x,x2)
geometric.mean(x)
geometric.mean(x2)
geometric.mean(X)
geometric.mean(X,na.rm=FALSE)